Tennessee State Route 21
SR 21; primary in red, secondary in blue | ||||
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 39.88 mi (64.18 km) | |||
| Existed | October 1, 1923–present | |||
| Major junctions | ||||
| West end | Mississippi River near Tiptonville | |||
| SR 22 / SR 78 at Tiptonville US 51 at Troy US 45W in Union City US 51 / SR 22 in Union City SR 690 / Future I-69 in Union City | ||||
| East end | KY 116 / KY 239 north of Union City at the Kentucky state line | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Obion, Lake | |||
| Highway system | ||||
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State Route 21 (SR 21) is a two lane highway that runs from the Mississippi River west of Tiptonville, Tennessee to the Kentucky state line north of Union City. This road provides access to Reelfoot Lake State Park.